The Ngrave Is the Most Secure Hardware Wallet Ever Made. But Is It Any Good? DeFi First Looks, DeFi Videos / By Robin Schmidt / June 28, 2022 June 29, 2022 / Cold Wallet, DeFi, NGRAVE, video, Wallets NGRAVE have made what they claim is the most secure hardware wallet ever made. The only financial product to be rated EAL7. This is our review.